Type of warship (11)
'type of warship' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for destroyer that I've seen before include "Military vessel" , "Naval ship" , "Apollyon's" , "Vandal" , "likely to break down" .)
(Other definitions for minesweeper that I've seen before include "Naval vessel" , "In the main, clearer" , "PC game" , "Warship" , "One removing bombs" .)